package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    // 新增菜品和对应的口味
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        log.info("新增菜品：{}",dishDTO);
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);// 将dishDTO中的相关属性值复制到dish对象中
        //向菜品表插入一条语句
        dishMapper.insert(dish);
        Long dishId = dish.getId();// 获取当前插入的菜品的id,因为口味的数据库中有外键关联，所以需要将dishId设置到DishFlavor对象中

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);//设置当前的口味是属于哪个菜品的id
            }
            //向口味表插入n条数据
            dishFlavorMapper.insertDishFlavor(flavors);
        }
    }

    // 菜品分页查询
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    // 批量删除菜品
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能删除，起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){ //1：起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);//起售中的菜品不能删除
            }
        }
        //判断当前菜品是否被套餐关联了，关联了不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            dishFlavorMapper.deleteByDishId(id);//删除菜品口味表数据
//        }
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteBatch(ids);
        //根据菜品id集合批量删除菜品口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    //根据id查询菜品和对应的口味
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        DishVO dishVO = new DishVO();
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到VO
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    //修改菜品
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表数据
        dishMapper.update(dish);
        //删除原有口味表中的数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //插入新的口味表数据
        if(dishDTO.getFlavors() != null && dishDTO.getFlavors().size() > 0){
            for (DishFlavor flavor : dishDTO.getFlavors()) {
                flavor.setDishId(dishDTO.getId());
            }
            dishFlavorMapper.insertDishFlavor(dishDTO.getFlavors());
        }
    }
    //启售停售
    @Override
    public void startOrStop(Integer status, Long id) {
        //停售菜品
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);//可以直接调用修改的mapper
        //如果是停售操作，还需要将包含当前菜品的套餐也停售
        if(status == StatusConstant.DISABLE){
            //把id转化成集合
            List<Long> ids = new ArrayList<>();
            ids.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if(setmealIds != null && setmealIds.size() > 0){
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(status)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }

    }

    //根据分类id查询菜品
    @Override
    public List<DishVO> list(Long categoryId) {
        //创建查询条件
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<DishVO> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (DishVO d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}












